Teledyne 7120 - NDIR analyzer - Manual (Page 60)

Infrared Analyzer Operation 4
4-27 Teledyne Analytical Instruments
If the concentration detected is over range, the first line of the display blinks
continuously.
4.8 Programming
CAUTION: The programming functions of the Set Range and
Curve Algorithm screens are configured at the facto-
ry to the users application specification. These func-
tions should only be reprogrammed by trained,
qualified personnel.
To program, you must:
1. Enter the password, if you are using the analyzer’s password
protection capability.
2. Connect a computer or computer terminal capable of sending an
RS-232 signal to the analyzer RS-232 connector. (See chapter 3
Installation for details). Send the rp command to the analyzer.
Now you will be able to select the APPLICATION and ALGORITHM
setup functions.
4.8.1 The Set Application Screen
The Set Application screen allows reprogramming of the three analysis
ranges and the calibration range (including impurity gas, background gas, low
end of range, high end of range, and % or ppm units). Original programming is
usually done at the factory according to the customer’s application. It must be
done through the RS-232 port using a computer running a terminal emulation
program.
Note: It is important to distinguish between this System program-
ming subfunction and the Range button function, which is an
operator control. The Set Range Screen of the Application
function allows the user to DEFINE the upper and lower limits
of a range AND the application of the range. The Range func-
tion only allows the user to select or define the limits, or to
select the application, but not to define the application.
Normally the Model 7100 is factory set to default to manual range selec-
tion, unless it is ordered as a single-application multiple-range unit (in which case
it defaults to autoranging). In either case, autoranging or manual range selection
can be programmed by the user.